Abstract
The designing of bolted joints of composite laminates requires, like all structural design, relevant failure criteria and methods for determining the stress distribution. This paper deals with stress analysis of bolted joints using the finite element method. There are several possible ways to treat the bolt/hole contact problem in the finite element model. One is to assume a certain contact pressure distribution acting on the boundary of loaded holes, for example a cosine distribution; another is to assume radial displacements equal to zero on the hole boundary, which yields a distributed contact reaction to the applied load. Performing a complete contact analysis is a third possibility, which obviously is the most accurate. In this paper, contact stresses and stresses in the vicinity of the hole boundary are calculated with account taken of the contact problem. Effects of laminate elastic properties, clearance, friction, load magnitude and bolt stiffness are studied. A comparison of the results with experimentally obtained data shows that most of these parameters affect the stress distribution significantly.
Published Version
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